Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description is the sole source of behavioral context. It only states the action without mentioning output format, error behavior, limitations, or authentication requirements. For a tool with no annotations, this is a significant gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single concise sentence that immediately states the tool's purpose. There is no waste, and the key information is front-loaded. This is exemplary in terms of brevity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple tool with one parameter and no output schema, the description covers the core purpose but omits return value details and potential use cases. It is adequate for basic understanding but leaves gaps in context, such as what the output looks like and when to prefer this over ocr_url or ocr_table_url.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has a single 'url' parameter with no description (0% coverage). The description adds the context that the URL must point to an image, which provides some meaning, but it does not clarify required URL formats, accessibility, or other constraints. This is minimal compensation for the lack of schema descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'OCR text from an image URL' clearly states the action (OCR) and the resource (image URL), making it easy to understand. It implicitly distinguishes from ocr_table_url by specifying 'image', but does not explicitly contrast with sibling tools like ocr_url, preventing a perfect score.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use this tool (when OCR text from an image URL is needed) but provides no explicit guidance on alternatives or exclusions. Given sibling tools like ocr_table_url and ocr_url, explicit differentiation would be valuable, but the usage is still inferable.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.